Vulnerability Details CVE-2026-34052
LTI JupyterHub Authenticator is a JupyterHub authenticator for LTI. Prior to version 1.6.3, the LTI 1.1 validator stores OAuth nonces in a class-level dictionary that grows without bounds. Nonces are added before signature validation, so an attacker with knowledge of a valid consumer key can send repeated requests with unique nonces to gradually exhaust server memory, causing a denial of service. This issue has been patched in version 1.6.3.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 17.2%
CVSS Severity
CVSS v3 Score 5.9
References
Products affected by CVE-2026-34052
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cpe:2.3:a:jupyter:lti_jupyterhub_authenticator:0.4.0
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cpe:2.3:a:jupyter:lti_jupyterhub_authenticator:1.0.0
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cpe:2.3:a:jupyter:lti_jupyterhub_authenticator:1.1.0
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cpe:2.3:a:jupyter:lti_jupyterhub_authenticator:1.2.0
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cpe:2.3:a:jupyter:lti_jupyterhub_authenticator:1.3.0
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cpe:2.3:a:jupyter:lti_jupyterhub_authenticator:1.4.0
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cpe:2.3:a:jupyter:lti_jupyterhub_authenticator:1.5.0
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cpe:2.3:a:jupyter:lti_jupyterhub_authenticator:1.5.1
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cpe:2.3:a:jupyter:lti_jupyterhub_authenticator:1.6.0
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cpe:2.3:a:jupyter:lti_jupyterhub_authenticator:1.6.1
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cpe:2.3:a:jupyter:lti_jupyterhub_authenticator:1.6.2